Sometimes research and fashion crisscross each other in interesting ways. Last summer it was obvious when looking at the windows of high-end department stores in Switzerland and Austria that the objects of the 18th century collector were absolutely en vogue. The trend trickled down to widely circulated interior magazines, and curiosities became popular at German and Belgian flea markets. From mounted animals to midcentury plant illustrations to Scottish gin named "the Botanist" - why that int..